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Add 21/80 and 9/5

1st number: 21/80, 2nd number: 1 4/5

21/80 + 9/5 is 33/16.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 5 is 80

    Next, find the equivalent fraction of both fractional numbers with denominator 80
  2. For the 1st fraction, since 80 × 1 = 80,
    21/80 = 21 × 1/80 × 1 = 21/80
  3. Likewise, for the 2nd fraction, since 5 × 16 = 80,
    9/5 = 9 × 16/5 × 16 = 144/80
  4. Add the two like fractions:
    21/80 + 144/80 = 21 + 144/80 = 165/80
  5. 165/80 simplified gives 33/16
  6. So, 21/80 + 9/5 = 33/16
    In mixed form: 21/16

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